Nortel Networks 1000 - Manual (Page 363)

Sender and receiver mode 363
XMFC sender and receiver specifications
Table 151 "XMFC sender specifications" (page 363) and Table 152 "XMFC
receiver specifications" (page 363) provide the operating requirements for
the NT5K21 XMFC/MFE card. These specifications conform to CCITT R2
recommendations: Q.441, Q.442, Q.451, Q.454, and Q.455.
Table 151
XMFC sender specifications
Forward frequencies in DOD mode: 1380, 1500, 1620, 1740, 1860, 1980 Hz
Backward frequencies in DOD mode: 1140, 1020, 900, 780, 660, 540 Hz
Frequency tolerance: +/- 0.5 Hz from nominal
Power level at each frequency: Selectable: 1 of 16 levels
Level difference between frequencies: < 0.5 dB
Harmonic Distortion and Intermodulation 37 dB below level of 1 signaling frequency
Time interval between start of 2 tones: 125 usec.
Time interval between stop of 2 tones: 125 usec.
Table 152
XMFC receiver specifications
Input sensitivity:
accepted:
rejected: -5 to -31.5 dBmONew CCITT spec.
-38.5 dBmOBlue Book
Bandwidth twist:
accepted:
rejected: fc +/- 10 Hz
fc +/- 60 Hz
Amplitude twist:
accepted: difference of 5 dB between adjacent frequencies
difference of 7 dB between non-adjacent frequencies
Norwegian requirement
rejected: difference of 12 dB (for unloaded CO trunks)
difference of 20 dB between any two frequencies
Operating time: < 32 msec.
Release time: < 32 msec.
Tone Interrupt no release: < 8 msec. Receiver on, while tone missing
Longest Input tone ignored: < 8 msec. Combination of valid frequencies
Noise rejection: S/N > 18 dB No degradation, in band white noise
S/N > 13 dB Out-of-band disturbances for CCITT
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
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